Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2d1820a52d7ff8…

MALICIOUS

PDF

39.1 KB Created: 2020-08-31 21:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de341fb7cc3ba8e7dc3b94b5ed0678fd SHA-1: f9e41f1e1868eac9120dc68ce4fbff096c7804ee SHA-256: df2d1820a52d7ff83c10e6eb5467616cda41ccae16f6b999ce5d4ce0d55f785f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text is largely unreadable due to encoding issues, but the presence of the malicious URL and the link farm heuristic suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wix?keyword=floral+crib+sheets+target
    • https://static.usrfiles.com/ugd/b8c837_09714c9640e64a18a20a9b21644430a9.pdf
    • https://static.usrfiles.com/ugd/bae363_fd1a368c4f6e4bf49ad06283d113cf5c.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_161ab85879c249758b5646175b7eb461.pdf
    • https://static.usrfiles.com/ugd/0bcf16_721005fef8424333a5b7f134c521c3b5.pdf
    • https://static.usrfiles.com/ugd/299074_bb04b6fe96aa495c936609560f232e27.pdf
    • https://static.usrfiles.com/ugd/9ea91e_5a1f0fe35c1d42d1aec99e2a8dc46ef3.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/non_faradaic_current.pdf
    • https://cdn.shopify.com/s/files/1/0433/5557/0341/files/62208145990.pdf
    • https://static.usrfiles.com/ugd/67e251_79dc6f26879d496194b4d50cb0dc86d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_0378499d807e41d8b2a47aa2df882a6c.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b25.bin
befa0d730d4481514b780573a44bfd8f63979e0e87f2bd5aca701d908895f160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B25 5156 bytes
font_01_sfnt_off00006ca5.bin
8744c7170d1564b8b1aa770005d10448e2040139c388b81705625b761dc5b305		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA5 10436 bytes

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